Chemical Identity and Properties

1,3-Bis(cyanomethyl)imidazolium chloride is an imidazolium salt in which both nitrogen atoms of the imidazolium ring bear cyanomethyl (–CH₂CN) substituents. The compound carries a permanent positive charge on the aromatic imidazolium core, balanced by a chloride counterion. This design imparts high polarity, good water solubility, and a relatively low tendency to absorb moisture compared with many simple halide imidazolium salts, though precautions against humidity are still recommended.

The dual nitrile groups extend the synthetic utility of this compound beyond a simple ionic liquid: they serve as handles for further functionalization, including conversion to amines, tetrazoles, or coordination sites for metal centers. The compound is typically obtained as a white to off-white crystalline or powdery solid with a high melting point consistent with its ionic nature.

Synthesis and Preparation Context

1,3-Bis(cyanomethyl)imidazolium chloride is commonly prepared by the double N-alkylation of imidazole with chloroacetonitrile under mild conditions. The reaction is typically carried out in an appropriate solvent (such as acetonitrile or THF) with controlled temperature to avoid side reactions. Because chloroacetonitrile is a lachrymator and toxic reagent, all synthesis steps should be performed in a well-ventilated fume hood with appropriate personal protective equipment (PPE).

Researchers purchasing the compound from Aladdin Scientific (SKU: B350396) receive a characterized, ready-to-use material, eliminating the need for in-house synthesis and associated hazard exposure. Confirm purity specifications on the accompanying Certificate of Analysis (CoA) prior to use in sensitive applications.

Handling, Storage, and Safety Guidelines

Personal Protective Equipment: Always wear laboratory coat, chemical-resistant gloves, and safety goggles when handling this compound. Although the isolated imidazolium salt presents lower acute hazard than its chloroacetonitrile precursor, the nitrile groups warrant standard precautions for toxic functional groups.

Storage: Store in a tightly sealed container in a cool, dry environment away from direct light. Moisture exposure can lead to hydrolysis of nitrile groups or caking of the solid over time. Storage under inert atmosphere (nitrogen or argon) is recommended for long-term preservation of purity.

Incompatibilities: Avoid contact with strong bases (which may deprotonate the C2–H of the imidazolium ring to generate a free NHC) unless such generation is intentionally desired for downstream reactions. Keep away from strong oxidizers and reducing agents.

Disposal: Dispose of waste in accordance with local institutional and governmental regulations for nitrile-containing chemical waste.

Key Applications in Research

N-Heterocyclic Carbene (NHC) Precursor: The imidazolium C2–H proton is sufficiently acidic to be removed by strong bases (e.g., NaH, KO^tBu, or KHMDS), generating a free NHC in situ. The resulting carbene can coordinate to transition metals (Pd, Ru, Au, Cu, Ni, etc.) to form highly active NHC–metal catalysts used in cross-coupling, olefin metathesis, and hydrogenation reactions.

Bifunctional Ionic Liquid Precursor: The dual –CH₂CN arms enable post-functionalization to create task-specific ionic liquids (TSILs) with applications in CO₂ capture, metal ion extraction, and supported ionic liquid phase (SILP) catalysis.

Coordination Chemistry: The nitrile groups can coordinate to metal centers in a κN fashion, allowing the design of multidentate ligand frameworks that combine NHC donor properties with nitrile coordination.

Organocatalysis: Free NHCs derived from this precursor can catalyze Stetter reactions, benzoin condensations, and other umpolung transformations relevant to complex molecule synthesis.

Quality Assurance and Procurement

Aladdin Scientific supplies 1,3-Bis(cyanomethyl)imidazolium chloride under SKU B350396, cross-referenced with Santa Cruz catalog number sc-287243. Each lot is accompanied by a Certificate of Analysis (CoA) detailing purity, appearance, and analytical data. Researchers are encouraged to request the CoA prior to or at the time of ordering to verify that the material meets their experimental requirements.

For bulk quantities, custom packaging, or additional analytical characterization (e.g., NMR, HPLC, elemental analysis), contact Aladdin Scientific's technical support team. Ensure that shipping and storage conditions specified on the product datasheet are maintained throughout the cold chain if temperature-sensitive shipment is recommended by the supplier.